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If you are just getting your feet wet in the welding trade or just wanting to get a back up unit, the
PowerARC 140STi offers quite a lot when you compare to the nearest competitors on the market.
The unit features 140 Amps of welding power for TIG and Stick. That’s enough to comfortably to
stick weld with 1/8” E7018 electrodes or weld 1/2” Steel with TIG in multiple passes. Really
though, its about the whole package. The Power ARC 140STi comes with a case to carry and store
your welder when not in use. It also comes with a TIG torch with a gas valve on the handle to per-
form lift start DC TIG welding. Of course, the unit also comes complete with a work clamp and
stick electrode holder. Compare that to many of the PowerARC 140STi’s competitors which if they
do have lift arc, the torch is likely not to come with it at the base price. The duty cycle holds up
well too. It also has the best warranty in the industry at the time of the publication. If you are in
the market , take a few minutes to compare these units side-by-side. You are going to find that
the PowerAC 140STi is a standout product in its field.
*This publication is based on available information on August 16, 2019. It relies on other manufacturer data which is subject to change and may vary in accuracy. Prices are also subject to change and are based off of MSRP or stated prices. NA= Not Applicable. Not listed=No information available at the time of
creation of this comparison.
N PowerARC 140STi Stickmate 160i 500570
Thunderbolt 907721
Miniarc 161LTS 0558011934
Forney Easy Weld 100ST 298
Invertec V155-S K6206-1
Century Inverter Arc 230 K2790-2
Price: 349.00 399.00 $385.00 $788.00 $208.00 $1523.00 $450.00
Voltage Input 120/240V 120/240V 120/240V 120/240V 120V 120/240V 240V
Max Rated Amp Input 120/240V Max Inrush or Manufacturer Stated Rated (Average)
28.1A 24.2A
21.4A 22.4A
21.4A 22.4A
32.5A 28.5A
30A NA
34A 33A
NA 30A
Stick Duty Cycle @ Maximum Amps 120/240V 35% @ 80A 35% @ 140A
20% @ 65A 30% @ 160A
20% @ 65A 30% @ 160A
35% @ 110A 35% @ 160A
30% @ 80A NA
30% @ 100A 30% @ 145A
NA 30% @ 150A
TIG Duty Cycle @ Maximum Amps 120/240V 35% @ 80A 35% @ 140A
Not TIG Capable Not TIG Capable 35% @ 110A 35% @ 160A
30% @ 80A NA
30% @ 130A 30% @ 155A
NA 30% @ 150A
Max OCV 70V 91V 91V 80V Not Specified 75V 9.5V (VRD)
Lift Start TIG (DC) Yes NA NA Yes Yes Yes Yes
Digital Display Yes No No No No No No
Built in Gas Solenoid Valve for Gas Flow Control No, Use Gas Valve Torch NA NA No, Use Gas Valve Torch No, Use Gas Valve Torch No, Use Gas Valve Torch No, Use Gas Valve Torch
TIG Kit Included (Base Model) Yes NA NA No Yes No NA
Stick Arc Force Control (DIG, Inductance etc.) Yes Adaptive (Not Adjustable) Adaptive (Not Adjustable) Adaptive (Not Adjustable) No Adaptive (Not Adjustable) No
Stick Hot Start Intensity Adjustment Yes Auto Auto Auto No Auto No
E6010 (Cellulosic Rods) Capability No Limited Limited Yes No Yes No
Stick Output Range 10-140A 20-160A 20-160A 5-160A 10-80A 5-155A 10-140A
TIG Output Range 10-140A NA NA 5-160A 10-100A 5-155A 10-150A
Weight 20 lbs. (9kg) 15 lbs. 15 lbs. 18 lbs. (8.2kg) 9.7 lbs. (4.4kg) 14.7 lbs. (6.7Kg) 21 lbs. (9.5Kg)
Dimensions 6”Wx10”Hx12”L 7.1”Wx10.5”Hx13.4”L 7.1”Wx10.5”Hx13.4”L 5.8”Wx10”Hx15.8”L 5.5”Wx10.5H”x12”L 6.2”Wx11.3”Hx15.4”L 5.5”Wx10”Hx14”L
Input Cable Length 6.5 Ft (2m) 6.5 Ft (2m) 6.5 Ft (2m) 10 Ft (3m) Not Specified 6.6 Ft (2m) 6 Ft (1.8m)
Warranty 5 Year Parts/Labor 3 Year Parts/Labor 3 Year Parts/Labor 3 Year Parts/Labor 1 Year 3 Year Parts/Labor 1 Year